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E("red")^(0) (Standard reduction potenti...

`E_("red")^(0)` (Standard reduction potential ) of different half-cells are given `E_(Cu^(+2)//Cu)^(0) = 0.34 V `
`E_(Zn^(+2)//Zn)^(0) = -0.76 V , E_(Ag^(+) // Ag)^(0) = 0.80 V , E_(Mg^(2+) // Mg)^(0) = -2.37` V . In which cell `DeltaG^(@)` is most negative ?

A

`Zn// Zn ^(2+) (1M)// // Mg^(2+) (1M)// Mg `

B

`Zn//Zn^(2+) (1M)// // Ag^(+) (1M)// Ag `

C

`Cu// Cu^(2+) (1M)// Ag^(+) (1M)// Ag `

D

`Ag// Ag^(+) (1M) // Mg^(+2) (1M)// Mg `

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaG^(0) = -ve implies E_("cell")^(0) = +ve`
a ) wrong` (E_("cell")^(0) -ve)` b)` E_("cell")^(0) = 0.80 + 0.76 = 1.56V`
c) `E_("cell")^(0) = 0.80 - 0.34 = 0.46 V ` d) wrong ` (E_("cell")^(0) =-ve )`
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